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Molecular Dynamics Simulations and Experimental Investigations of Atomic Diffusion Behavior at Bonding Interface in an Explosively Welded Al/Mg Alloy Composite Plate

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In this study, 6061 aluminum alloy and AZ31B magnesium alloy composite plate was fabricated through explosive welding. Molecular dynamics (MD) simulations were conducted to investigate atomic diffusion behavior at bonding interface in the Al/Mg composite plate. Corresponding experiments were conducted to validate the simulation results. The results show that diffusion coefficient of Mg atom is larger than that of Al atom and the difference between these two coefficients becomes smaller with increasing collision velocity. The diffusion coefficient was found to depend on collision velocity and angle. It increases linearly with collision velocity when the collision angle is maintained constant at 10° and decreases linearly with collision angle when the collision velocity is maintained constantly at 440 m/s. Based on our MD simulation results and Fick’s second law, a mathematical formula to calculate the thickness of diffusion layer was proposed and its validity was verified by relevant experiments. Transmission electron microscopy and energy-dispersive system were also used to investigate the atomic diffusion behavior at the bonding interface in the explosively welded 6061/AZ31B composite plate. The results show that there were obvious Al and Mg atom diffusion at the bonding interface, and the diffusion of magnesium atoms from magnesium alloy plate to aluminum alloy plate occurs much faster than the diffusion of aluminum atoms to the magnesium alloy plate. These findings from the current study can help to optimize the explosive welding process.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51375328).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Ting-Ting Zhang, Wen-Xian Wang, Jun Zhou, Xiao-Qing Cao & Yi Wei

  2. Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Ministry of Education, Taiyuan, 030024, China

    Ting-Ting Zhang, Wen-Xian Wang, Xiao-Qing Cao & Yi Wei

  3. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan, 030024, China

    Ting-Ting Zhang, Wen-Xian Wang & Yi Wei

  4. Department of Mechanical Engineering, Pennsylvania State University Erie, The Behrend College, Erie, PA, 16563, USA

    Jun Zhou

  5. Department of Mechanical Engineering, Key Laboratory for Advanced Materials Processing Technology, Tsinghua University, Beijing, 100084, China

    Rui-Shan Xie

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  1. Ting-Ting Zhang
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  2. Wen-Xian Wang
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  3. Jun Zhou
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Correspondence to Wen-Xian Wang.

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Zhang, TT., Wang, WX., Zhou, J. et al. Molecular Dynamics Simulations and Experimental Investigations of Atomic Diffusion Behavior at Bonding Interface in an Explosively Welded Al/Mg Alloy Composite Plate. Acta Metall. Sin. (Engl. Lett.) 30, 983–991 (2017). https://doi.org/10.1007/s40195-017-0628-x

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  • DOI: https://doi.org/10.1007/s40195-017-0628-x

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